One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

Woven tree art gives this towering Australian woodland a touch of mystical whimsy.

An original apothecary from 1792.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

This psychedelic tourist trap is a leisurely descent into madness.

Three columns of volcanic rock shoot out of the ocean.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

The largest whale museum in Europe allows visitors to walk among life-size giants.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

Home to three historic ships from the age of Vikings.

A little-visited waterfall in an otherworldly landscape.

This sprawling bookstore spans four floors and has more than a million books in stock.

The oldest church in Iceland is one of the few to feature ornate decoration.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

A nursery specializing in strange and beautiful succulents and cacti.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

This freshwater spring fills with 10,000 gallons of water per minute.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

Turnip-shaped island just off the Michigan shore in Lake Huron.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

The neighborhood shop is a sort of tiny cactus museum full of exotic specimens you can take home.